Remove --log-regexp.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index a05b187282c1170e6e600672738aefd35c5be952..ba4182ec45504abce4e56078d867ff0c45080e9b 100644
--- a/src/log.h
+++ b/src/log.h
@@ -218,11 +218,6 @@ class Logger : public CodeEventListener {
   INLINE(static void CallEventLogger(Isolate* isolate, const char* name,
                                      StartEnd se, bool expose_to_api));
 
-  // ==== Events logged by --log-regexp ====
-  // Regexp compilation and execution events.
-
-  void RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache);
-
   bool is_logging() {
     return is_logging_;
   }